Resumo

RODRIGUEZ, Edwin Alexander et al. RENDIMIENTO Y CAPACIDAD ANTIOXIDANTE DE EXTRACTOS DE ROSMARINUS OFFICINALIS, SALVIA OFFICINALIS Y PSIDIUM GUAJAVA OBTENIDOS CON CO₂ SUPERCRÍTICO. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2012, vol.36, n.140, pp.305-316. ISSN 0370-3908.

Extracts from stems and leaves of sage (Salvia officinalis, Labiatae Fam.) and rosemary (Rosmarinus officinalis, Labiatae Fam.) and from guava leaves (Psidium guajava, Myrtaceae Fam.), were obtained using supercritical CO₂. Polynomic models were formulated to relate yield with extraction conditions. The compositions of the volatile fractions of these extracts were determined using GC-MS. Their antioxidant capacity (ORAC) and the protection resultant from their addition to a cosmetic base subjected to lipid peroxidation as a result of its exposure to UV radiation were also measured. The extract from rosemary imparted the highest lipid peroxidation inhibition (88%), followed by those obtained from sage (76%) and guava leaves (43%). Rosemary and sage extracts exhibited a high antioxidant capacity (1,9 µmol Trolox®/mg), similar to those of BHT and vitamin E (2,8 and 3,0 µmol Trolox®/mg), respectively, and higher than that of the guava leaves extract (0,7 µmol Trolox®/mg).

Palavras-chave : Salvia officinalis; Rosmarinus officinalis; Psidium guajava; supercritical; antioxidant; ORAC; lipid peroxidation; hexanal.

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